只能调用一次的函数 [英] Functions that can be called only once

问题描述

我一直在使用以下方法:

I've been using the following approach:

$foo_called = false;

function foo()
{
    if($foo_called)
    {
        return;
    }

    $foo_called = true;

    // do something.
}

我一直在想是否存在更好/不同的方法.

I've been wondering if a better / different approaches existed.

推荐答案

仅出于代码清晰起见，我会执行以下操作:

Just for code clarity, I'd do something like this:

function foo()
{
    static $foo_called = false;
    if (!$foo_called) {
        $foo_called = true;
        // etc.
    }
}

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